以下为句子列表：
英文: The Watts Series 530C are spring operated bronze relief valves designed to be used only as protection from the build up of excessive pressure in systems containing water, oil or air.
中文: 美国瓦茨530C系列阀门是弹簧驱动青铜安全阀，仅仅适用于包含水、油或气的系统中，用来防止系统内压力过大。
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